Improvement in screw-drivers



G. P. LUDMIS.

Screw-Drivers Patented Feb. 3,1874.

V To all whom it may concern:

` blade, and a nut at the end to keep the handle in place.

UNITED STATES PATENT OFFICE.

GEORGE I. LOOMIS, OF UTICA, NEYV YORK.

IMPROVEMENT IN SCREW-DRIVERS.

Specification forming part of Letters Patent No. 147,059, dated February 3, 1874; application filed December 17, 1873.

Beit known that I, GEORGE I). Looms, of Utica, county of Oneida and State of New York, have invented a new and useful Improvement in Screw-Drivers; and I hereby declare that the following is a full, clear, and exact description of my invention, reference being. had to the Y. accompanying drawing, which forms a part of this specification.

Figure l is aside elevation. Fig. 2 is a longitudinalsection; Fig. 3, an end view of the handle B Fig. 4, a transverse section of the case O; Figs. 5 and 6, a plan and side view of the double pawl E.

Similar letters of reference denote like parts in all the figures.

My invention consists et' a steel blade, A, having a round shank, which extends entirely through the handle, with a shoulder next the On this round shank the wood handle B turns freely. A metal, disk, D, with certain projections and recesses, as shown at a t a, is Vattached to the handle by means of screws or otherwise, and of course turning` with the handle. On the end of the shank, next the blade, is placed the metal case O. Hthin this case is placed the doubletoothed pawl E, which is kept in place by a round screw-pin, F, on which the pawl swings freely. This pin passes entirely through the ease C, the pawl E, and the shank of the blade A, causing the whole to turn together. The pawl has two teeth, x w, one on each side of the pin, and both facing the same way. One of the l teeth is kept in contact with the disk D by the bevel bolt and springs, (shown at H,) which press on the angular spline on the back ot' the pawl. An arm of this pawl passes through the slot a. in the case C.

In using this screw-driver, the handle is at all times held .rmly in the hand. A tooth of the pawl, catching in one of the recesses of the disk, turns the blade with a forward motion of the handle. With the backward movement of the handle the pawl slips over the projection on the disk, so that with the alternate forward and backward motions of thelhandle, the blade has only a forward movement. Tol turn the blade the other way, the projecting arm of the pawl is thrown to the other end of the slot, which brings the opposite tooth o'f the pawl in contact with the disk, and turns tl'ieblade with the backward motion of the hand.

I hereby disclaim the device as shown in the patent of H. L. Hildreth, No. 112,143, February 2S, 1871, for a screw-driver.

What I claim as new and my invention, and desire to secure by Letters Patent, is-

The blade A, in combination with the double reversible toothed pawl E, supported by pin F, which passes through casey O and spindle of blade A, sp1-in g H, which. returns the pawl to position, and disk D, with its projection engaging the pawl E, all arranged as described, for the purpose set forth.

HBO. I?. LOOMIS. lvitnesses:

DEXTER GILLMORE, ALFRED BANIsTnn. 

